procfs doubts

procfs doubts

[Dattatray Kulkarni]

Hi,
I have some doubts regarding proc file system in linux.
1. read_proc & get_info have similar functionality. when i do cat
/proc/net/some_procfile, read_info function is called. then how & when
get_info function is called?
2. What is the exact difference between proc_create_entry &
proc_register?  Is it necessary to write both of these functions?
3 . How the function write_proc works? and when that function is called
by the kernel?
regards,
dattatray.

Re: procfs doubts

[Erik Mouw]

On Thu, Aug 09, 2001 at 02:53:04PM +0530, Dattatray Kulkarni wrote:
> I have some doubts regarding proc file system in linux.
> 1. read_proc & get_info have similar functionality. when i do cat
> /proc/net/some_procfile, read_info function is called. then how & when
> get_info function is called?

AFAIK get_info() is deprecated, you have to use read_proc().

> 2. What is the exact difference between proc_create_entry &
> proc_register?  Is it necessary to write both of these functions?

proc_register() is no longer an exported function, you have to use
proc_create_entry() and friends.

> 3 . How the function write_proc works? and when that function is called
> by the kernel?

It's all explained in the procfs guide in Documentation/DocBook/. Just
run "make psdocs" in your kernel tree and you'll get it nicely
formatted.


Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
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